One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,7,4,6)(25,26,30,34)(27,31,36,40)(28,33,29,38)(32,37,39,35)(1,3,5,4)(2,6,8,7)(9,10)(11,17)(12,15)(13,16)(14,19)(18,23)(20,22)(21,24)(25,27,30,36)(26,31,34,40)(28,37,29,35)(32,33,39,38)(9,11,13,19)(10,14,16,17)(12,20,21,18)(15,23,24,22)(25,27)(26,32)(28,35)(29,37)(30,36)(31,38)(33,40)(34,39)(1,3,5,4)(2,7,8,6)(9,12,13,21)(10,15,16,24)(11,18,19,20)(14,22,17,23)(25,27)(26,31)(28,37)(29,35)(30,36)(32,38)(33,39)(34,40)(1,4,5,3)(2,6,8,7)(10,16)(14,17)(15,24)(22,23)(25,28,30,29)(26,33,34,38)(27,35,36,37)(31,32,40,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.